« Maybe he didn’t start it, but he sure as hell spread it. »
Everyone knows that the zombie hordes emerged from the wilderness at the black plague’s outset. Yet, they didn’t strike just one town or city, but many regions across the kingdoms. The best (remaining) wizards and scholars believe that its creation was an act of raw necromantic power, but its propagation resembles a malignant disease. As such, many, many creatures can be carriers, and the Rat King’s gift with rats makes him a natural harbinger of this virulent doom. He’s kept safe and secure by Tobias, his enormous pet rat who watches his back night and day.